<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <com-a @handler="getData"></com-a>
    </div>

    <script src="./vue.js"></script>
    <script>
      const comA = {
        template: `
          <div>
      <h1>{{msg}}</h1>
      <button @click='send'>点击触发传递数据</button>
         </div> `,
        data() {
          return {
            msg: "子组件数据",
          };
        },
        methods: {
          send() {
            this.$emit("handler", this.msg);
          },
        },
      };

      var vm = new Vue({
        el: "#app",
        data: {
          getMsg: "",
        },
        components: {
          comA,
        },
        methods: {
          getData(res) {
            console.log(res);
            this.getMsg = res;
          },
        },
      });
    </script>
  </body>
</html>
